Latch bar assembly for replaceable cover

ABSTRACT

The proximate ends of a plastic roll sheathing are formed with offset shouldered flanges in opposition. These flanges extend into a rectangular groove in the surface of the roll body and together provide a mortise cavity into which a T-shaped tenon is fitted and secured to the body with fasteners. At least one of the ends of the sheathing is further extended so as to overlay the clamp joint so formed and abut the other end.

United States Patent COVER 8 Claims, 6 Drawing Figs.

US. Cl 29/118, 29/129 Int. Cl B60b 7/00 Field of Search 29/1 18, 129;83/659, 346

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References Cited UNITED STATES PATENTS Stickney Howe Rosenhauer...

Rowley Culver l-laecker Primary ExaminerAlfred R. Guest Attorney-WalterG. Finch 29/118UX 29/118UX 29/118UX 29/118UX 29/118UX ABSTRACT: Theproximate ends of a plastic roll sheathing are formed with offsetshouldered flanges in opposition. These flanges extend into arectangular groove in the surface of the roll body and together providea mortise cavity into which a T- shaped tenon is fitted and secured tothe body with fasteners. At least one of the ends of the sheathing isfurther extended so as to overlay the clamp joint so formed and abut theother end.

PATENIED SEP 7 |97| 1 I INVENTOR CHARLES E. SMITH BY w l y'% LATCH BARASSEMBLY FOR REPLACEABLE COVER This invention relates generally torolls, and more particularly it pertains to an anchoring arrangement foran annular resilient cover for a roll. Plastic covered rolls are used inthe packaging industry as backup drums against which the cutting bladeswork. Generally those blades have a saw-toothed cutting edge whichdrives down through the corrugated board and into the resilient cover.

Such service produces severe wear and so odd peripheral speedrelationship and lateral translation of the roll is used to distributethe contact as widely as possible. Since the knives may then cut againstany peripheral portion of the drum surface, it is important that noirregularity exists thereover.

Accordingly, it is an object of this invention to provide a latch bararrangement for roll covers which secures the sheathing ends withminimum discontinuity therebetween and thus approaches a continuouscover.

Another object of this invention is to provide a wraparound piece coverfor a roll which is easily replaced without dismantling the roll fromthemachine.

Yet another object of this invention is to provide a latch bararrangement for roll covers in which the fastener tool access apertureis simply and effectively filled.

Other objects and attendant advantages of this invention will becomemore readily apparent and understood from the following detailedspecification and accompanying drawings in which:

FIG. 1 is an end view of the rolls of a sheet fed rotary die cutter forcorrugated board in which the backup drum incorporates features of thisinvention;

FIG. 2 is a top view of the die cutter of FIG. 1;

FIG. 3 is a detail drawing, partially broken away, showing the method ofsecuring the improved latch bar arrangement to the backup drum;

FIG. 4 shows the elements of the joint itself in exploded view;

FIG. 5 is a drawing similar to FIG. 2 but showing a second embodiment ofthe invention; and

FIG. 6 is a fragmentary detail view of the elements of the joint for theembodiment of FIG. 5.

Referring now to the details of the invention as shown in FIGS. 1 and 2,reference numeral 10 indicates generally the improved latch bararrangement for wraparound roll covers 12. These covers 12 are made of aresilient sheet material, such as polyurethane, rubber, or otherelastomer and are used singly or side-by-side in plurality to surface abackup roll 14.

The knives 16 of the main cutting die roll 18 penetrate the blank B asit passes through the process of cutting and must at all times bebacked-up or a poor cut will result. A tubular sleeve cover with nojoints could be used, but would require the dismantling of the machinein order to replace the cover over the drum axle. With the present cover12, this is unnecessary and in addition, the joint is practicallycontinuous.

This joint 10, as best shown in FIGS. 3 and 4, consists of forming bothends of the cover 12 with an offset flange 20. EAch flange 20 isprovided with a shoulder 22 and these oppose each other when installedwithin a rectangular recess 24 cut longitudinally in the surface of thedrum body 26 of the backup roll 14.

One of the ends of the cover 12 is lengthened further a short distanceto form a flap 28. A latch bar 30 made of T-shaped stock is installed soas to engage the shoulders 22 of both flanges 20. The flap 28 is liftedas shown in FIG. 3 to allow screws 32 to be installed in verticalcountersunk holes 34 in the latch bar 30. These screws 32 are tappedinto the drum body 26 and when the screwdriver T is removed, the flap 28falls back on top of the latch bar 30 and the screws 32 to abut theother end of the cover 12 forming a joint-10 devoid of discontinuitiesand perfectly continuous in radius.

If the material from which the cover 12 is made is not capable ofproviding a flap 28 flexible enough to turn back, it is plossible toprovide the modification 40 as shown in FIGS. 5. ere, the flap 28 rsprovided with a drilled clearance hole 42 for access to each latch barscrew. After the latter is fastened through the latch bar 30 and thescrew driver is removed, the holes 42 are filled flush with shortcylindrical plugs 44 of the same material as used for the cover 12.

It should be understood that the knives 16 need not be in a singleradial plane on drum 18, but may be otherwise arranged in plurality atangular relationship with each other and transversely of the web so asto completely sever an area from the blank stock B. In suchcircumstances it is of advantage to interchange the rolls l8 and 26 sothat the knives 16 enter from above and the resulting severed area willthus be aided in falling free from the stock.

Obviously many modifications and variations of the present invention arepossible in light of the above teachings. It is, therefore, to beunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as specifically described.

I claim:

I. In combination, a cylindrical roll having a transverse recess in thesurface of said roll and extending in the longitudinal directionthereof, and a resilient cover sheet for said roll, said cover sheethaving proximate ends positioned over said transverse recess, an offsetflange on the undersurface of said cover sheet adjacent each saidproximate end and projecting inwardly into said transverse recess, ashoulder on each said flange and arranged to oppose each other, with allsaid flanges and shoulders forming a mortise joint, a Tshaped tenonengaging all said shoulders of said sheet at said mortise joint, meansfor fastening said T-shaped tenon to said roll, one of the proximateends of said cover sheet forming a flap over said T- shaped tenon andextending to abut with the other proximate end of said cover sheet, withthe outer surface of said cover sheet forming a smooth continuationacross said mortise joint.

2. In the combination as recited in claim 1, wherein said tenon is aT-section bar having at least one perforation, with said transverserecess having a tapped hole, with said fastening means comprising ascrew passing through said perforation and engaging in said tapped hole.

3. In the combination as recited in claim 2, with said extending flapproximate end of said cover sheet covering said screw.

4. In the combination as recited in claim 3, with said extending flapproximate end of said cover sheet having an access hole therethrough atsaid screw, and a resilient plug for filling said access hole.

5. In the combination as recited in claim 1, wherein the abutment ofsaid cover sheet are parallel with said T-shaped tenon.

6. In the combination as recited in claim 5, wherein the abutment ofsaid proximate ends is adjacent said T-shaped tenon, in spacedrelationship with said perforation.

7. In the combination as recited in claim 2, wherein said screw has ahead countersunk in said perforation, with said T- shaped tenon lyingwholly with said transverse recess.

8. In the combination as recited in claim I, with all said flanges andT-shaped tenon transversely filling said transverse recess.

1. In combination, a cylindrical roll having a transverse recess in thesurface of said roll and extending in the longitudinal directionthereof, and a resilient cover sheet for said roll, said cover sheethaving proximate ends positioned over said transverse recess, an offsetflange on the undersurface of said cover sheet adjacent each saidproximate end and projecting inwardly into said transverse recess, ashoulder on each said flange and arranged to oppose each other, with allsaid flanges and shoulders forming a mortise joint, a T-shaped tenonengaging all said shoulders of said sheet at said mortise joint, meansfor fastening said T-shaped tenon to said roll, one of the proximateends of said cover sheet forming a flap over said T-shaped tenon andextending to abut with the other proximate end of said cover sheet, withthe outer surface of said cover sheet forming a smooth continuationacross said mortise joint.
 2. In the combination as recited in claim 1,wherein said tenon is a T-section bar having at least one perforation,with said transverse recess having a tapped hole, with said fasteningmeans comprising a screw passing through said perforation and engagingin said tapped hole.
 3. In the combination as recited in claim 2, withsaid extending flap proximate end of said cover sheet covering saidscrew.
 4. In the combination as recited in claim 3, with said extendingflap proximate end of said cover sheet having an access holetherethrough at said screw, and a resilient plug for filling said accesshole.
 5. In the combination as recited in claim 1, wherein the abutmentof said cover sheet are parallel with said T-shaped tenon.
 6. In thecombination as recited in claim 5, wherein the abutment of saidproximate ends is adjacent said T-shaped tenon, in spaced relationshipwith said perforation.
 7. In the combination as recited in claim 2,wherein said screw has a head countersunk in said perforation, with saidT-shaped tenon lying wholly with said transverse recess.
 8. In thecombination as recited in claim 1, with all said flanges and T-shapedtenon transversely filling said transverse recess.